Signature and other printing dies for printing machines



Aug. 15, 1939. H. T. BUCK El AL 2,169,676

SIGNATURE AND OTHER PRINTING DIES FOR PRINTING MACHINES Filed May 2'7, 1938 INVENTORS I flaw/mo ZGuck y Wm 44 CE @001 FCBRNEYS Patented Aug. 15, 1939 PATENT OFFICE SIGNATURE AND OTHER. PRINTING mas FOR PRINTENG MACHINES Howard T. Buck, Cedar Knolls, N. J.,.and Wallace A. Buck, Brooklyn, N. Y., assignors to T. S. Buck Manufacturing 00., New York, N. Y., a corporation of New York Application May 27, 1938, Serial No. 210,400

4 Claims.

This invention relates to signature or other printing dies for multigraphing or other printing machines and broadly comprehends an improved unitary signature or other printing die backing member or base the construction of which is such as to render the same self-sustaining on the standard types of signature or other drums of multigraphing or printing machines.

The invention resides more particularly in the provision of a resilient substantially semi-cylindrical backing member or base which is adapted to clampingly embrace and intimately fit against the periphery of the signature or other drum of a multigraphing or other printing machine and which is further provided with detent means protruding from the inner concave surface thereof and so spaced as to selectively cooperate with correspondingly spaced sets of depressions in the signature or other drum for locating the backing 10 member thereon and for retaining the same against circumferential or axial shifting movement with reference to the drum.

As a further feature the invention embodies means at the longitudinal edges of the backing member or base for facilitating the application of the backing member or base to the drum and the removal of the same therefrom.

With the above enumerated and other objects in view, the invention is set forth in greater detail in the following specification and illustrated in the accompanying drawing, in which:

Fig. 1 is a perspective view of a standard sig-- nature drum of a multigraphing machine with a signature printing die backing member or base 5 constructed in accordance with the invention in applied relation thereto.

Fig. 2 is a longitudinal sectional View therethrough taken approximately on the line 2-2 of Fig. 1.

40 Fig. 3 is a transverse sectional view taken approximately on the line 3-3 of Fig. 2.

Fig. 4 is a perspective view of the die backing member or base removed from the signature drum.

5 Referring to the drawing by characters of reference, l0 designates the standard type of signature drum of a multigraphing machine which is formed with radial apertures or depressions I l arranged in spaced sets and heretofore thread- 50 ed and commonly employed to receive screws for attaching clips to clamp the signature printing die backing member or base to the periphery of the drum III.

In the present invention the signature die I2 55 which is usually of rubber, is secured to a substantially semi-cylindrical resilient backing member or base l3 which is slightly greater than a half cylinder and the inherent resiliency of which is such as to cause the same to clampinglyembrace and intimately fit against the periphery of the signature drum Ill when the same is en- 1 gaged thereover.

In order to facilitate the application of the member or base l3 to the drum ID, the opposite longitudinal edges thereof are curved outwardly 10 to provide lips M which define a flared entrance mouth and obviously said lips will be forced and spread apart a distance equal to the diameter of the drum and placed under tension until the inner concave surface of the member or base; coincides with and intimately fits the periphery of the drum. In addition to facilitating the application of the member or base l3 to the drum, the lips I4 provide finger gripping means for facilitating the removal of the member or base from the drum.

The base or member I3 is provided with detent means for the purpose of locating the backing member on the signature drum so that the signature will be printed in the proper position on 25 the letter and for retaining the same against circumferential or axial shifting movement with reference to the drum after the proper location has been obtained. The detent means consists of one or more projections l5 protruding from the inner concave surface of the backing member or base l3, two being shown in the present instance to selectively cooperate with correspondingly spaced sets of depressions II in the drum l0. Preferably the projections l5 consist of teats struck inwardly from the base or backing member l3 and of a proper size to engage within the depressions l I.

From the foregoing it will be apparent that due to the shape and resiliency of the backing member or base, combined with the detent means l5, a unitary backing member or base for signature printing dies for multigraphing machine signature drums has been provided which is self-sustaining on the drum against accidental or unintentional displacement or relative movement with reference thereto when in applied position, thus eliminating the necessity of employing separate means of attachment or securement.

While the invention has been illustrated and described as applied to the signature roll of a multigraphing machine, it is to be understood that the same is applicable to printing dies for other types of printing machines.

iii

What is claimed is:

1. The combination with the printing die drum of a printing machine having a depression in the periphery thereof, of a printing die backing member fashioned from resilient sheet material of concavo-convex cross sectional shape defining an arc of greater extent than one-half the periphery of the drum so as to inherently clamp and retain itself in embracing relation on the surface of the drum, and detent means projecting from the in ner concave surface of said member adapted to engage within the drum depression to locate the backing member thereon and to retain the same against circumferential or axial shifting movement with reference thereto.

2. The combination with the printing die drum of a printing machine having depressions in the periphery thereof, of a printing die backing member fashioned from resilient sheet material of concavo-convex cross sectional shape defining an arc of greater extent than one-half of the periphery of the drum so as to inherently clamp and retain itself in embracing relation on the surface of the drum, detent means projecting from the inner concave surface of said member adapted to engage within the drum depressions to locate the backing member thereon and to retain the same against circumferential or axial shifting movement with reference thereto, and out-turned lips at the opposite longitudinal free edges of said backing member constituting means for facilitating the application of the backing member to and the removal of the same from the drum.

3. The combination with the printing die drum of a printing machine having depressions in the periphery thereof, of a split cylindrical printing die backing member fashioned from resilient sheet material defining an arc of greater extent than one-half the periphery of the drum with the opposite longitudinal edges thereof spaced apart a lesser distance than the diameter of the drum and adapted to be sprung apart for engaging the same with and disengaging the same from the drum, and in-struck detent studs projecting from the inner concave surface of said member adapted to engage within the drum depressions to locate the backing member thereon and to retain the same against circumferential or axial shifting movement with reference thereto.

4. The combination with a printing die drum of a printing machine having circumferentially spaced pairs of longitudinally spaced depressions in the periphery thereof, of a split cylindrical printing die backing member of resilient material defining an arc of greater extent than one-half the periphery of the drum, the opposite longitudinal edges thereof being spaced apart a lesser distance than the diameter of the drum and adapted to be sprung apart for engaging the same with and disengaging the same from the drum, and a pair of detent studs projecting from the inner concave surface of said member spaced apart longitudinally to coincide with the spacing of the pairs of depressions in the drum and adapted to be selectively engaged within the pairs of drum depressions to locate the backing member thereon and to retain said member against circumferential movement with reference thereto.

HOWARD T. BUCK. WALLACE A. BUCK. 

